Google Voice doesn't work with Google Fi

If you sign up for Google Fi with a Google Account that’s linked to your Google Voice number, you can:

Transfer your Google Voice number to Google Fi.

Get a completely new number. Your Google Voice number will be released and you won’t be able to get it back.

Transfer your carrier number instead of your Google Voice number. If you transfer your carrier number to Fi, your Google Voice number will be released and you won’t be able to get it back.

Whichever option you choose, once you activate Google Fi service on your phone, you’ll no longer have Google Voice on the Google Account you use with Google Fi. Keep in mind that Google Fi includes many of the best features from Google Voice, but you won’t be able to use the Google Voice website and apps or Google Talk to make calls and send texts, and check new voicemail.

If you ever cancel your Google Fi service, you’ll have the option to bring the number you were using with Google Fi back to Google Voice.

If you want to keep using Google Voice

If you want to continue to use Google Voice with your current Google Voice number, you have a couple options:

Sign up for Google Fi with a Google Account that’s not linked to your Google Voice.

Transfer your Google Voice number to a different Google Account (as long as it doesn’t already have a Google Voice number) before you sign up for Google Fi. There’s no cost to transfer between Google Accounts.

If you use one of these options, you can use the Google Voice app on your Google Fi phone with your original Google Voice number.

Note: You won’t be able to forward a Google Voice number to a Google Fi number or forward a Google Fi number to a Google Voice number.